I think your mother is the best person to guide you
I will tell you some simple things.
Always take your meal in time.
Never take junk food.
Take 6 to 8 glass of water daily.
Take fruit & vegetables as well.
Keep balance between rest & play. Always take less salt & less pepper (red pepper).
It will help you all life to be healthy.
Until you feel hungry do not eat food.
You must play & do exercise.